Booting Problem

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http://askubuntu.com – I recently installed 12.04 on my new dell laptop 3420 having 8GB RAM,intel i5,500gb HDD , nvidia 620m 1gb graphic card. Firstly i faced problem with wifi but it resolved then i loaded nvidia current drivers after this when i powered it ON ........it start showing blank screen and caps lock led keep on blinking to rectify this i have to remove the battery physically and power on and start ubuntu in recovery mode. To rectify this I uninstalled nvidia drivers but the problem(Blank screen) again persist. Now today in the morning i installed Ubuntu 11.10 from CD. but again it given the blank sc (HowTos)